/* * Copyright (C) 2003-2009 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "page.h" #include <glib.h> #include <assert.h> #include <string.h> /** * Allocates a new #page object, without filling the data element. */ static struct page * page_new(size_t size) { struct page *page = g_malloc(sizeof(*page) + size - sizeof(page->data)); assert(size > 0); page->ref = 1; page->size = size; return page; } struct page * page_new_copy(const void *data, size_t size) { struct page *page = page_new(size); assert(data != NULL); memcpy(page->data, data, size); return page; } struct page * page_new_concat(const struct page *a, const struct page *b) { struct page *page = page_new(a->size + b->size); memcpy(page->data, a->data, a->size); memcpy(page->data + a->size, b->data, b->size); return page; } void page_ref(struct page *page) { g_atomic_int_inc(&page->ref); } static void page_free(struct page *page) { assert(page->ref == 0); g_free(page); } bool page_unref(struct page *page) { bool unused = g_atomic_int_dec_and_test(&page->ref); if (unused) page_free(page); return unused; }